Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Telephone Main Antenna Circuit Short to Ground (B15CB11,B15CB13)
DESCRIPTION
This DTC is stored when the DCM (telematics transceiver) detects an open or a short in the telephone antenna (main) circuit.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B15CB11 | Telephone Main Antenna Circuit Short to Ground | Telephone antenna (main) impedance (Ω) is lower than the malfunction threshold for 10 seconds or more when the engine switch is on (IG) (Short circuit) |
|
| B15CB13 | Telephone Main Antenna Circuit Open | Telephone antenna (main) impedance (Ω) is higher than the malfunction threshold for 10 seconds or more when the engine switch is on (IG) (Open circuit) |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Safety Connect System.
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PROCEDURE
| 1. | CHECK DTC |
(a) Turn the engine switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG) and wait for 10 seconds or more.
(d) Turn the Techstream on.
(e) Clear the DTCs.
Body Electrical > Telematics > Clear DTCs(f) Check for DTCs and check that no DTCs are output.
Body Electrical > Telematics > Trouble CodesOK:
No DTCs are output.
| OK |  | USE SIMULATION METHOD TO CHECK |
|
| 2. | INSPECT TELEPHONE AND GPS ANTENNA CORD (NO. 6 ANTENNA CORD SUB-ASSEMBLY) |
| (a) Disconnect the antenna connector from the Telephone and GPS antenna (for Roof Side). |
|
(b) Disconnect the antenna connector from the No. 2 antenna cord sub-assembly.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A-4 - B-1 | Always | Below 1 Ω |
| A-4a - B-1a | Always | Below 1 Ω |
| A-4 or B-1 - Body ground | Always | 10 kΩ or higher |
| NG | | REPLACE TELEPHONE AND GPS ANTENNA CORD (NO. 6 ANTENNA CORD SUB-ASSEMBLY) |
|
| 3. | INSPECT TELEPHONE AND GPS ANTENNA CORD (NO. 2 ANTENNA CORD SUB-ASSEMBLY) |
| (a) Disconnect the antenna connector from the No. 6 antenna cord sub-assembly. |
|
(b) Disconnect the antenna connector from the antenna cord sub-assembly.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| B-1 - C-1 | Always | Below 1 Ω |
| B-1a - C-1a | Always | Below 1 Ω |
| B-1 or C-1 - Body ground | Always | 10 kΩ or higher |
| NG | | REPLACE TELEPHONE AND GPS ANTENNA CORD (NO. 2 ANTENNA CORD SUB-ASSEMBLY) |
|
| 4. | INSPECT TELEPHONE AND GPS ANTENNA CORD (ANTENNA CORD SUB-ASSEMBLY) |
| (a) Disconnect the antenna connector from the No. 2 antenna cord sub-assembly. |
|
(b) Disconnect the antenna connector from the DCM (telematics transceiver).
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| C-1 - D-1 (TEL MAIN) | Always | Below 1 Ω |
| C-1a - D-1a (GND) | Always | Below 1 Ω |
| C-1 or D-1 (TEL MAIN) - Body ground | Always | 10 kΩ or higher |
| NG | | REPLACE TELEPHONE AND GPS ANTENNA CORD (ANTENNA CORD SUB-ASSEMBLY) |
|
| 5. | CHECK TELEPHONE AND GPS ANTENNA (for Roof Side) |
(a) Replace the telephone and GPS antenna (for Roof Side) with a known good one.
Click here
(b) Clear the DTCs.
Body Electrical > Telematics > Clear DTCs(c) Recheck for DTCs and check that no DTCs are output.
Body Electrical > Telematics > Trouble CodesOK:
No DTCs are output.
| OK | | END (TELEPHONE AND GPS ANTENNA [FOR ROOF SIDE] IS DEFECTIVE) |
|
| 6. | REPLACE DCM (TELEMATICS TRANSCEIVER) |
(a) Replace the DCM (telematics transceiver) with a new one.
Click here
NOTICE:
- The engine switch must be off.
- Do not exchange the DCM (telematics transceiver) with one from another vehicle.
| NEXT | | PERFORM DCM ACTIVATION |
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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